Fluid-pressure oscillating motor



' June 5. 1928. 1,672,227

B. J. NELSON FLUID PRESSURE OSCILLATING MOTOR 2 Sheets-Sheet 1 smut fierz J Naiaan June 5, 1928.

B. J. NELSON FLUID PRESSURE OSCILLATING MOTOR Filed Jan. 26, 2 Sheets-Sheet 2 Patented June 5, 1928.

UNITED STA BERT :r. NELSON,

OF DETROIT, MICHIGAN, ASSIGNOR TO WHITE SHOWERS, 'INC.,

DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

FLUID-PRESSURE OSCILLATING MOTOR.

Application filed January 26, 1925; Serial No. 4,973. r

This invention relates to a fluid pressure oscillating motor, and is particularly designed for use in oscillating or turning a heavy section of a spray conduit used in an overhead irrigation system. p

The particular problem encountered is'the fact that this long section of the irrigation system is relativelyheavy and it requires considerable force to oscillate the same. With oscillating motors of the usual type it is necessary to build large size motors which are capable of developing suflicient power for turning the spray conduit or oscillating the same. tice to connect the spray conduits directly to the motor so that the fluid pressure operates directly against apiston which is so connected to the spray conduit that the same is oscillated once for each stroke of the piston.

In this invention it has been the object to reduce the size of the motor and to incorporate therein motion translating means whereby the motion developed by the motor can be applied in such a way as to give a large leverage for oscillating the spray conduit slowly. It has been found that the use of a small motor with this motion translating mechanism is sufficient to oscillate the heavy and long spray conduit of an overhead irrigation system.

Additional means arealso provided for reversing the rocking motion of the motor at any number of predetermined points determined by the amount of ground area which it is desired to irrigate.

In the drawings:

Fig. 1 is an elevation of the motor constructed in accordance with my invention.

Fig. 2 is a plan view of the same.

Fig. 3 is a vertical seotion taken on the line 3- 3 of Fig. l. I

Fig. 4 is a vertical section taken on the line H of Fig. 3.

Fig. 5 is a detail showing the connection between the pawl and reciprocating member and the means for reversing the rocking movement of the motor.

a designates a stationary feed pipe of a fluid pressure main which is suitably connected by the elbow b to the short length of pipe 0 which obviously, is also held stationary. This pipe section .0 supports, by a suitable swivel coupling d, the casting e, which is. therefore allowed to freely turn .with t e source of fluid pressure. It has generally beenthe pracvalves to both move about the stationary pipe section 0. A bracket f is clamped to the pipe section 0 and there is secured thereto a segmental rack 9 provided with a plurality of teeth 71..

A short length of pipe 2' is screwed into the top of the casting e and supports the central casting j of the motor element. This casting j is provided with two-chambers k and m, the latter chamber being in communication with the pipe section i, interior of the casting e and the feed pipe a, thereby placin the chamber at in communication Secured to either side of this casting j are the cylinders n and 0. Passageways are provided for connecting the chambers and m with the interior of both cylinders, the passageways in each chamber positioned directly opposite each other, and arranged to be closed by the compound valves 12 andg. These valves are bridged at their free ends by the straps 1*, so that both valves are actuated together. In the position shown in Fig. 4, the valves are positioned to allow the incoming fluid pressure to enter the cylinder n, thereby forcing the piston s, is not shown in Fig. 4 but is shown in Fig. '1, to the outer end and allowing the fluid pressure in the cylinder o to exhaust into the chamber is and out through the pipe t through the spraying nozzle 21.. Contained within the cylinder 0 is a piston 2) which is provided with the spring pressed striker w arranged to strike the strap 1", carried by the valve, thereby causing the compound to the right, as seen in Fig. 4, and reversing the valves whereby the fluid is-allowed to flow intoothe chamber 0 from the chamber m, and exhaust the cylinder 71. into the chamber k. This will force the piston "v to the'left and bring the piston 5' into contact with the strap 7-, carried on the other end of the compound valves. This piston s, is provided with a similar striker. w, as is the piston 2), so that each piston actuates the valve when it reaches the bottom of its stroke for reversing the direction of the fluid, thereby reversing the motor.

The pistons are rigidly secured to a reciprocating frame av, so that both pistons are worked together. This reciprocating frame is provided with a pin at an intermediate point and the casting 7' has pivoted thereto as at 1, a lever 2 which is slotted as at 3, the pin 3 being-engaged in this slot,

which so thatas the recipnocat-ing frame be moves, is carries with it the lever 2. Plvoted to this lever, as at 4, is a pawl 5.

in the downwardly projectingarm 7. rigidly carried by the lever 2. A: coil spring" 8' is positioned about this leg, 6, and 1s placed,

shown. in Fig. 5 this maintains the, pawlin a certain, set position. As, shown in the drawings (see Fig, 1) thepawl isv so v positionedthat the same may. freely; ride over the teeth or, the rack. when. moved to the; right, but, on movement tending to move the pawl to the left the pawl engages the teeth, andholds the pawl, sothat" the movementfmust be compensated by a rocking movement of the motor element; about. its pivot. Onthe next return stroke of thepiston the pawl slides over the next tooth oi the rack and on the next power strolre ot the piston the motor element is rocked a little further.v This action, is repeateduntil at a predetermined point. it is desiredto reverse the pawl so as to allow ,thereciprocat-ing member which is connected to the pawl" to operate themotor element in a. reverse direction. This is ohtainedby avery. simple device. A plurality ofi'holes 11. are provided inthe segmental'racli, g, andthe pins 12 may be fitted in these holes 11,,one onfeach ex.- treme end of the rack if," it v is so desired, to operate the motor; the extreme limit of its movement. Qbviously smaller degrees ofmovement may be-ohtained' by inserting the pin into thev intermediate holes; As shown in Fig. 5, this pin 12 is positioned in the path of the pawl 5, and as the same moves in the direction of the arrow the pawl engages the pin and is slowly forced backwardly until the pivot 13 between the leg 6 and the pawl passes the center line drawn through the pivot, et and the outwardly extendinglip or ear 10, The initial} movement of this pawl will compress the spring 81 and as the same passes over the dead center the spring. will then be allowed to expand and quickly throw'the pawl over to the left, thereby providing a very snappy throw to the pawli Themotor' cevelops a uniform reciprocating motion to the frame a andupon the reversing of the pawl the pawl; grips the teeth of the rack in such a way. asto reverse the rocking action of the motor.

With a device such as is shown in the drawings, the timeinterval for one complete movement of the pawlfrom one endot the rack to the other-is about ten minutes, thereby providing a very slow oscillatingmovement' off'the motor, the relatively slow oscillating movement of'the motor element being This pawl has 'pivoted thereto adownwardly extending leg 6 that is adapted-to pass through ahol'e oscillating movement iseflect'edf by: az 'motor element which. is relatively small, and this is accomplished by reason of considerable l'everagethrough which the motor element acts. The invention is particularly directed to irrigating systems-wherein relatively long lengths oi: pipe are oscillated, and, inasmuch as; relative movement is obtained between the rack device and, the motor; element, the rack device could be fifxedfto. the oscillated pipe as well as to the stationary pipe,,in which case the motor element, wouldbe fixed to. the stationary, pipe,

What I claim is:

l. A fluid pressure oscillating In 0. 0l,.,C .m: prising a support, a segmental: rack secured; thereto, a motor element pivoted to said support and including a piston and; cylinder, means for conducting-fluid under pressureto said motor element to reciprocatethepiston, a reciprocating, member secured to'th e pisg ton and arrangedto be reciprocatedthereby, and intermittent motion; translating means including a connectionbetween the] iiecipro eating member and ra'cl'n for converting the relatively rapid reciprocating movement of the reciprocating member to. arelatively slow oscillating movement. of the motor element,

2. A fluid'pressureoscillating motor, com} prising a. support, a segmentafrack secured thereto, a motor element pivoted to; said support and including a piston and-cylinder, means for condnctingfiuid under pressure to Said motor element lfOr reciprocating the piston, a reciprocating member, securedfto the piston-and arranged tobe reciprocated thereby, motion translating; meansincluding a pawl and connections between the pawl and reciprocating member, whereby the pawl is so. positioned as to engage the} rack and cause the motor element to roclein one difrection when the pawl. is actuated the reciprocating motion of the reciprocating member, and means for reversing the position of the pawl with respectltotheyrack for operating the motor element; in a-,re'- verse direction, it

3. A fluid'pressure oscillatingmotorecom, prising a supprogrt a segmental rack secured thereto, a'motor element pivot'edf tog said support and including-a piston and cylin'der, means for conducting a' fluid under-pres sure to saidmotor elementv to reciprocate the piston, a reciprocating member carried" hy the piston and arranged to be; reciprocated thereby, motion translatingmeans including a lever pivoted to saidmotor elementgthe free end;ot saidlever beingengaged hysa'id reciprocating member and rockedthereby, a pawlcarried' by said leverand arranged pawl arranged to engage with theracli' and to be moved whenwthe lever is movedi'said positioned in such a manner as to cause the motor element to rock when the pawl is actuated by the reciprocating movement .thereof, and means for reversing the position of the pawl forreversing the movement of the motor element.

4. A fluid pressure oscillating motor, comprising a support, a segmental rack carried thereby, a motor element pivoted to said support and including a piston and cylinder, means for conducting the fluid under pres sure to said motor element to reciprocate the piston, va reciprocating member secured to the piston and reciprocated thereby, motion translating means for effecting a rocking movement of the motor between the reciprocating member and rack and including a pivoted pawl and connections between the said pawl and reciprocating member including resilient means for maintaining the pawl in a certain position for controlling the direction of the rocking movement of the motor element, pins removably secured to the rack which are projected in the path of the pawl for reversing the position of the pawl and causing the same to translate the reciprocating piston movement in a reverse oscillating 0r rocking movement of the motor element.

5. In a fluid pressure oscillating motor,

the combination of a support, a segmental toothed rack carried by said support, a motor element pivoted to said support and provided with a pair of opposed cylinders and pistons, a reciprocating frame member secured to said pistons operating in said cylinders, a pawl connected with the reciprocating member arranged to engage the teeth of said segmental rack, means for introducing fluid under pressure alternately to said cylinders for actuating the reciprocating member and pawl connected therewith, whereby the pawl picks up a tooth on the rack at each complete stroke of the pistons thereby causing the said motor element to rock slowly in one direction, and means for reversing the pawl at a predetermined time to reverse said rocking action.

6. A fluid pressure motor, comprising in combination a pair of supports mounted'for movement relative to each other, a rack de vice secured to onesupport, a motor element .consistin of a cylinder and a piston secured to the ot er'support, means for conducting the fluid to the cylinder to reciprocate the piston, means operatively connected to the piston including a dog for engagement with the rack whereby a reciprocating movementof the piston is translatedinto an intermittent movement betweenthe rack and the mounted on the motor element and opera tively connected to the piston and engaging the rack device whereby reciprocating move-.

ment of the piston is translated into an intermittent movement between the mot-or element and. the rack in one direction, and means on the rack and acting on the dog to reverse the direction of such intermittent movement. v

8. A fluid pressuremotor, comprising in combination a pair of supports mounted for relative movement, a rack device secured to one support, a motor element secured to the other support consisting of a cylinder and a piston, means for conducting fluidunder pressure to reciprocate the piston, a pawl pivotally mounted on the motor element and engaging the rack, means operatively connecting the piston and the pawl whereby the pawl slides along the rack in one movement of the piston and locks to the rack in another movement of the piston to cause relative intermittent movement between the two supports, and means for swinging the pawl on its pivot to change its position to reverse the direction of said intermittent movements.

In testimony whereof I have affixed my signature.-

BERT J. NELSON. 

